Metal-door construction



A. R. GROSS METAL 560R CONSTRUC'NON Filed June 13, 1927 Patented Aug. 14, 1928. UNITED STATES PATENT OFFICE.

ARTHUR B. GROSS, OF ST. PAUL, MINNESOTA, ASSIGNOR TO GROS S METAL PRODUCTS COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION 01' MINNESOTA.

mn'rannoon corfszrrwerr01w Application filed June 13, 1921. Serial No. 198,488.

struction of a sheet metal unit or shell including a pair of laterally spaced plates and an internal truss structure therefor, and more particularly to a method of connecting the sheet metal plates forming the shell, whereby they are interlocked against movement in respect to each other in all d rections transversely of the shell.

use, is especially adapted for use in the construction of a hollow sheet metal door.

To the 'above end,-generallystated, the inventionconsists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which lllustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a fragmentary lan view showing the to of a hollow s eet metal door constructe in accordance with the invention and with its up erend closureremove'd;

. Fig. 2 is a fiagmentary detail view in section taken on the line 22 of Fig 1;

Fig. 3 is a fragmentary perspective v ew of the front plate detached from the door;

Fig. 4 is a fragmentary perspective view ofdthe back plate detached from the door; an

Fig. 5 is a fragmentary perspective view of the internal truss structure removed from.

the 'door.

Referrin now in detail to the invention, the. shell, orming the sheet metal door illustrated, comprisesa front plate 6 and ,a back plate 7, laterally therefrom. These plates" 6 and 7, at their longitudinal edge portions, are bentlaterally toward each other in substantially the same plane to form the edge portions of the door, only one of which is shown. The edge-forming section of the front late 6 is relatively wide and indicated by t e numeral 8, and the edge-formingsection of the back plate 7 is relatively narrow and indicated by the numeral 9. By reference to Fig. 1, it will be noted that the edge forming sections 8 and 9 have abutting engagement at theirlongitudinal edges andeform a relatively tight joint 10 therebetween. The edge section 8 of the front plate 6 is extended at the joint' 10 to form a laterally and inward} offset main angle member 11 which spans e joint The invention, while intended-for general- -member 15 affords a sto 1 0 and fits in the-corner formed by the back plate 7 and its edge section 9.

Within the door shell is a truss structure 12, for the platesfi and 7, comprising a corrugated sheet metalplate of a lighter gauge than that ofsaid plates. The corrugations in the plate '12 are 'of the same depth as the space between the lates 6 and 7, and said corrugations have at apexes 13 that alternately and directly engage the inner faces of said plates. The corrugated plate 12, at its flat apexes 13, is rigidly and permanently secured by spot welding, as indicated at 14, to the plates 6 and 7. Saidcorrugated plate 12, at its apex adjacent to the joint 10 is' extended to form a laterall and inwardly offset secondary angle mem er 15 that fits within the main angle'member 11. The offset in the corrugated plate 12 at. the angle shoulder 16 with which the longitudinal e go of the flange of the angle member 11, which bears against the inner face of theback plate 7, directly engages.

In assembling the door structure, the

the truss truss structure 12 is then welded to thefrontd plate 6. From the above description it is evident that the interlockingjoint between the front plate 55; and the back plate 7" securely and rigidly connects said plates againstmovement in all directions tranjsi gagement, said front plate having a laterallyand inwardly offset main angle member that spans the joint between said platesand fits in the corner of the back plate, and a truss rigidly secured to the back plate and having abutting engagement with the edge of the res ective flan e'of the main angle member, sai truss having a laterally. and" inwardly thereto by spot welding atsthe apex of the corrugations, said truss at one of its apexes havin a laterally and inwardly? ofiset secon ary angle member that fits within the mam angle member, said truss at the secondary an le member havin a stop shoulder .with w ich the edge of t 0 adjacent flange of the main angle member abuts.

3. A pair of connected plates, one of which is provided with a lateral extension in the same plane as the adjacent portion of the other plate, said other plate having a laterally otfset angle extension fitting in the corner formed by said lateral extension and the respective plate, one flange of said angle extension being parallel to said lateral extension and in direct contact therewith anti its other ilange being parallel to the respective plate and in direct contact therewith, and means for holding the angle extension in said corner.

4. A pair of connected plates, one of which is provided with a lateral extension in the same plane as the adjacent portion of the other plate, said other plate having a latera ofl'set extension fitting in the corner forme by said lateral extension and the respective plate, and a member attached to the plate having said lateral extension and en gagin the angle extension to hold the same msai corner.

5; A pair of connected plates, one ofwhich is provided with a lateral extension and an angle member in the corner formed by said plate and its extension, the flanges of the angle member being laterally spaced from said lateral extension and the respective plate to form an angle recess therebetween, said lateral extension and the adjacent portion of the other plate being in the same plane, said other plate having a laterally 05 set angle extension in said angle recess.

- In testimony whereof I aflix my signature.

ARTHUR R. GROSS. 

